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<meta name="description" content="假设，在作业提交系统中学生需要录入提交的 Java 文件名称及要提交到的邮箱地址，那么就需要对学生输入的这些信息进行校验，判断输入是否有误。校验的规则为：录入的文件名称必">
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			<h1>Java项目实战：校验文件名和邮箱地址</h1>
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			<div id="arc-body">假设，在作业提交系统中学生需要录入提交的 Java 文件名称及要提交到的邮箱地址，那么就需要对学生输入的这些信息进行校验，判断输入是否有误。校验的规则为：录入的文件名称必须以“.java”结尾，录入的邮箱地址中必须包含有“@”符号和“.”符号，且“@”在“.”之前。<br>
<br>
在这里使用 String 类中的 indexOf() 方法、charAt() 方法和 lastIndexOf() 方法来完成此程序。具体实现代码如下：
<div class="snippet-container" style="undefined;"><div class="sh_bright snippet-wrap"><div class="snippet-menu sh_sourceCode" style="display: none;"><pre><a class="snippet-copy sh_url" href="http://c.biancheng.net/view/vip_7053.html#" style="display: none;">复制</a><a class="snippet-text sh_url" href="http://c.biancheng.net/view/vip_7053.html#">纯文本</a><a class="snippet-window sh_url" href="http://c.biancheng.net/view/vip_7053.html#">复制</a></pre></div><pre class="java sh_java snippet-formatted sh_sourceCode"><ol class="snippet-num"><li><span class="sh_keyword">public</span> <span class="sh_keyword">static</span> <span class="sh_type">void</span> <span class="sh_function">main</span><span class="sh_symbol">(</span>String<span class="sh_symbol">[]</span> args<span class="sh_symbol">)</span> <span class="sh_cbracket">{</span></li><li>    <span class="sh_type">boolean</span> filecon <span class="sh_symbol">=</span> <span class="sh_keyword">false</span><span class="sh_symbol">;</span> <span class="sh_comment">// 判断文件名是否合法</span></li><li>    <span class="sh_type">boolean</span> emailcon <span class="sh_symbol">=</span> <span class="sh_keyword">false</span><span class="sh_symbol">;</span> <span class="sh_comment">// 判断邮箱地址是否合法</span></li><li>    System<span class="sh_symbol">.</span>out<span class="sh_symbol">.</span><span class="sh_function">println</span><span class="sh_symbol">(</span><span class="sh_string">"************ 欢迎进入作业提交系统 ************"</span><span class="sh_symbol">);</span></li><li>    <span class="sh_usertype">Scanner</span><span class="sh_normal"> </span>input <span class="sh_symbol">=</span> <span class="sh_keyword">new</span> <span class="sh_function">Scanner</span><span class="sh_symbol">(</span>System<span class="sh_symbol">.</span>in<span class="sh_symbol">);</span></li><li>    System<span class="sh_symbol">.</span>out<span class="sh_symbol">.</span><span class="sh_function">println</span><span class="sh_symbol">(</span><span class="sh_string">"请输入要提交的Java文件名称："</span><span class="sh_symbol">);</span></li><li>    <span class="sh_usertype">String</span><span class="sh_normal"> </span>name <span class="sh_symbol">=</span> input<span class="sh_symbol">.</span><span class="sh_function">next</span><span class="sh_symbol">();</span> <span class="sh_comment">// 获取输入的Java文件名</span></li><li>    System<span class="sh_symbol">.</span>out<span class="sh_symbol">.</span><span class="sh_function">println</span><span class="sh_symbol">(</span><span class="sh_string">"请输入要提交到的邮箱地址："</span><span class="sh_symbol">);</span></li><li>    <span class="sh_usertype">String</span><span class="sh_normal"> </span>email <span class="sh_symbol">=</span> input<span class="sh_symbol">.</span><span class="sh_function">next</span><span class="sh_symbol">();</span> <span class="sh_comment">// 获取输入的邮箱地址</span></li><li>    <span class="sh_comment">// 检查输入的文件名是否合法</span></li><li>    <span class="sh_type">int</span> index <span class="sh_symbol">=</span> name<span class="sh_symbol">.</span><span class="sh_function">lastIndexOf</span><span class="sh_symbol">(</span><span class="sh_string">'.'</span><span class="sh_symbol">);</span> <span class="sh_comment">// 获取"n"所在的位置</span></li><li>    <span class="sh_comment">// 判断合法</span></li><li>    <span class="sh_keyword">if</span> <span class="sh_symbol">(</span>index <span class="sh_symbol">!=</span> <span class="sh_symbol">-</span><span class="sh_number">1</span> <span class="sh_symbol">&amp;&amp;</span> name<span class="sh_symbol">.</span><span class="sh_function">charAt</span><span class="sh_symbol">(</span>index <span class="sh_symbol">+</span> <span class="sh_number">1</span><span class="sh_symbol">)</span> <span class="sh_symbol">==</span> <span class="sh_string">'j'</span> <span class="sh_symbol">&amp;&amp;</span> name<span class="sh_symbol">.</span><span class="sh_function">charAt</span><span class="sh_symbol">(</span>index <span class="sh_symbol">+</span> <span class="sh_number">2</span><span class="sh_symbol">)</span> <span class="sh_symbol">==</span> <span class="sh_string">'a'</span></li><li>            <span class="sh_symbol">&amp;&amp;</span> name<span class="sh_symbol">.</span><span class="sh_function">charAt</span><span class="sh_symbol">(</span>index <span class="sh_symbol">+</span> <span class="sh_number">3</span><span class="sh_symbol">)</span> <span class="sh_symbol">==</span> <span class="sh_string">'v'</span> <span class="sh_symbol">&amp;&amp;</span> name<span class="sh_symbol">.</span><span class="sh_function">charAt</span><span class="sh_symbol">(</span>index <span class="sh_symbol">+</span> <span class="sh_number">4</span><span class="sh_symbol">)</span> <span class="sh_symbol">==</span> <span class="sh_string">'a'</span><span class="sh_symbol">)</span> <span class="sh_cbracket">{</span></li><li>        filecon <span class="sh_symbol">=</span> <span class="sh_keyword">true</span><span class="sh_symbol">;</span></li><li>    <span class="sh_cbracket">}</span> <span class="sh_keyword">else</span> <span class="sh_cbracket">{</span></li><li>        System<span class="sh_symbol">.</span>out<span class="sh_symbol">.</span><span class="sh_function">println</span><span class="sh_symbol">(</span><span class="sh_string">"输入的文件名无效！"</span><span class="sh_symbol">);</span></li><li>    <span class="sh_cbracket">}</span></li><li>    <span class="sh_comment">// 检查邮箱地址是否合法</span></li><li>    <span class="sh_keyword">if</span> <span class="sh_symbol">(</span>email<span class="sh_symbol">.</span><span class="sh_function">indexOf</span><span class="sh_symbol">(</span><span class="sh_string">'@'</span><span class="sh_symbol">)</span> <span class="sh_symbol">!=</span> <span class="sh_symbol">-</span><span class="sh_number">1</span> <span class="sh_symbol">&amp;&amp;</span> email<span class="sh_symbol">.</span><span class="sh_function">indexOf</span><span class="sh_symbol">(</span><span class="sh_string">'.'</span><span class="sh_symbol">)</span> <span class="sh_symbol">&gt;</span> email<span class="sh_symbol">.</span><span class="sh_function">indexOf</span><span class="sh_symbol">(</span><span class="sh_string">'@'</span><span class="sh_symbol">))</span> <span class="sh_cbracket">{</span></li><li>        emailcon <span class="sh_symbol">=</span> <span class="sh_keyword">true</span><span class="sh_symbol">;</span></li><li>    <span class="sh_cbracket">}</span> <span class="sh_keyword">else</span> <span class="sh_cbracket">{</span></li><li>        System<span class="sh_symbol">.</span>out<span class="sh_symbol">.</span><span class="sh_function">println</span><span class="sh_symbol">(</span><span class="sh_string">"输入的邮箱地址无效!"</span><span class="sh_symbol">);</span></li><li>    <span class="sh_cbracket">}</span></li><li>    <span class="sh_comment">// 输出校验的结果</span></li><li>    <span class="sh_keyword">if</span> <span class="sh_symbol">(</span>filecon <span class="sh_symbol">&amp;&amp;</span> emailcon<span class="sh_symbol">)</span> <span class="sh_cbracket">{</span></li><li>        System<span class="sh_symbol">.</span>out<span class="sh_symbol">.</span><span class="sh_function">println</span><span class="sh_symbol">(</span><span class="sh_string">"作业提交成功!"</span><span class="sh_symbol">);</span></li><li>    <span class="sh_cbracket">}</span> <span class="sh_keyword">else</span> <span class="sh_cbracket">{</span></li><li>        System<span class="sh_symbol">.</span>out<span class="sh_symbol">.</span><span class="sh_function">println</span><span class="sh_symbol">(</span><span class="sh_string">"作业提交失败!"</span><span class="sh_symbol">);</span></li><li>    <span class="sh_cbracket">}</span></li><li><span class="sh_cbracket">}</span></li></ol></pre><pre class="snippet-textonly sh_sourceCode" style="display:none;">public static void main(String[] args) {
    boolean filecon = false; // 判断文件名是否合法
    boolean emailcon = false; // 判断邮箱地址是否合法
    System.out.println("************ 欢迎进入作业提交系统 ************");
    Scanner input = new Scanner(System.in);
    System.out.println("请输入要提交的Java文件名称：");
    String name = input.next(); // 获取输入的Java文件名
    System.out.println("请输入要提交到的邮箱地址：");
    String email = input.next(); // 获取输入的邮箱地址
    // 检查输入的文件名是否合法
    int index = name.lastIndexOf('.'); // 获取"n"所在的位置
    // 判断合法
    if (index != -1 &amp;&amp; name.charAt(index + 1) == 'j' &amp;&amp; name.charAt(index + 2) == 'a'
            &amp;&amp; name.charAt(index + 3) == 'v' &amp;&amp; name.charAt(index + 4) == 'a') {
        filecon = true;
    } else {
        System.out.println("输入的文件名无效！");
    }
    // 检查邮箱地址是否合法
    if (email.indexOf('@') != -1 &amp;&amp; email.indexOf('.') &gt; email.indexOf('@')) {
        emailcon = true;
    } else {
        System.out.println("输入的邮箱地址无效!");
    }
    // 输出校验的结果
    if (filecon &amp;&amp; emailcon) {
        System.out.println("作业提交成功!");
    } else {
        System.out.println("作业提交失败!");
    }
}</pre></div></div>
运行该程序，当用户输入的文件名是以“.java”结尾，并且输入的邮箱地址中包含有“@”符号和“.”符号，“.”符号在“@”符号之后，才能检测通过，打印“作业提交成功！”， 如下所示：
<pre class="info-box">************ 欢迎进入作业提交系统 ************
请输入要提交的Java文件名称：
answer.java
请输入要提交到的邮箱地址：
answer@qq.com
作业提交成功!</pre>
否则，打印“作业提交失败！”，如下所示：
<pre class="info-box">************ 欢迎进入作业提交系统 ************
请输入要提交的Java文件名称：
abcjava
请输入要提交到的邮箱地址：
abcjava@qqcom
输入的文件名无效！
输入的邮箱地址无效!
作业提交失败!</pre>
在该程序中，首先使用 lastlndexOf() 方法获取用户输入 Java 文件中的所在的位置。因为 Java 文件是以“.java”结尾的，因此，可以使用 charAt() 方法来检测“.”之后的字符串是否是 java，即通过如下所示的条件判断表达式即可判断出用户输入的 Java 文件名是否以“.java”结尾。
<div class="snippet-container" style="undefined;"><div class="sh_bright snippet-wrap"><div class="snippet-menu sh_sourceCode" style="display:none;"><pre><a class="snippet-copy sh_url" href="http://c.biancheng.net/view/vip_7053.html#" style="display: none;">复制</a><a class="snippet-text sh_url" href="http://c.biancheng.net/view/vip_7053.html#">纯文本</a><a class="snippet-window sh_url" href="http://c.biancheng.net/view/vip_7053.html#">复制</a></pre></div><pre class="cpp sh_cpp snippet-formatted sh_sourceCode"><ol class="snippet-num"><li>index<span class="sh_symbol">!=-</span><span class="sh_number">1</span><span class="sh_symbol">&amp;&amp;</span>name<span class="sh_symbol">.</span><span class="sh_function">charAt</span><span class="sh_symbol">(</span>index<span class="sh_number">+1</span><span class="sh_symbol">)=</span><span class="sh_string">'j'</span></li><li>         <span class="sh_symbol">&amp;&amp;</span>name<span class="sh_symbol">.</span><span class="sh_function">charAt</span><span class="sh_symbol">(</span>index<span class="sh_number">+2</span><span class="sh_symbol">)=</span><span class="sh_string">'a'</span></li><li>         <span class="sh_symbol">&amp;&amp;</span>name<span class="sh_symbol">.</span><span class="sh_function">charAt</span><span class="sh_symbol">(</span>index<span class="sh_number">+3</span><span class="sh_symbol">)=</span><span class="sh_string">'v'</span></li><li>         <span class="sh_symbol">&amp;&amp;</span>name<span class="sh_symbol">.</span><span class="sh_function">charAt</span><span class="sh_symbol">(</span>index<span class="sh_number">+4</span><span class="sh_symbol">)=</span><span class="sh_string">'a'</span></li></ol></pre><pre class="snippet-textonly sh_sourceCode" style="display:none;">index!=-1&amp;&amp;name.charAt(index+1)='j'
         &amp;&amp;name.charAt(index+2)='a'
         &amp;&amp;name.charAt(index+3)='v'
         &amp;&amp;name.charAt(index+4)='a'</pre></div></div>
<br>
在检测邮箱地址是否合法时，首先使用了 indexOf() 方法判断用户输入的邮箱地址中是否含有符号，然后判断邮箱地址中的“.”符号是否在“@”符号之后，如果这两个条件都满足，则邮箱地址是合法的。<br>
<br>
当文件名称和邮箱地址的检测都通过时，则打印“作业提交成功！”，否则打印“作业提交失败！”。</div>
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